Cryptology Terminology

noun a number that is equal to the sum of its proper divisors, excluding itself

adjective describing the quality of being exact or without fault

• A perfect number is a positive integer that is equal to the sum of its proper divisors, excluding itself.
• A perfect number is a cool math thing where the number equals the sum of its divisors.
• Dude, did you know about perfect numbers? They're like, totally awesome!
• In a world of imperfect numbers, a perfect number shines like a rare gem.

noun Aenigma is a noun referring to a riddle, mystery, or puzzle that is difficult to solve.

• The meaning of the ancient text remained aenigma to scholars for centuries.
• The puzzle was a real aenigma, I couldn't figure it out no matter how hard I tried.
• I thought I had cracked the code, but it turned out to be a total aenigma.
• Her mind was like a complex aenigma, full of hidden layers waiting to be deciphered.